Abstract: In order to analyze the wear characteristics of disc cutters during TBM construction in spiral tunnels, the cutter replacement and wear data obtained from the TBM excavation of the Beishan spiral ramp were collected, and the surrounding rock data along the ramp were obtained. A comparative analysis was conducted on the number of cutter replacements, cumulative cutter wear, and cutter wear rate under similar surrounding rock conditions in straight and curved sections. The results show that the cutter consumption per unit advance in curved sections is significantly higher than that in straight sections, especially the increase in abnormal failure proportion of center cutters and the increase in wear rate of edge cutters. Combined with the wear mechanism of cutters under the two alignment conditions, it is found that the cutters are subjected to unbalanced forces in curved sections, and the lateral forces on edge cutters increase significantly, resulting in an increase in their wear rate.